Casein glue



atentedl Clct. 26, 192.

HENRY I4. PRESTHOLDT, 01E MINNEAPOLIS, MINNESOTA.

CASEIN GLUE.

No Drawing.

My present invention provides a new comosition of matter, herein designated as casein glue, but which, from its broader aspect, is an adhesive composition adapted to be used, by itself or commingled with other substances, as an adhesive coating.

In this improved adhesive composition,

casein is used as the adhesive base and is commingled with calcium hydroxide, calcium chloride, sodium sulphite, trisodium phosphate, sodium molybdate and oil. Preferably, both kerosene and castor oil are used. Sodium molybdate is introduced to prevent and retard the formation of nitrogen and 15 precipitates ammonia. This composition makes an excellent, high grade joint glue havinga liquid life of several days withoutdeterioration.

I have obtained a very highly efiicient glue or adhesiveby the use of the above substances in accordance with the following formula:

Parts.

Casein -l 50 to 75 Calcium hydroxide 10 to 30 Calcium chloride 5 to Sodium sulphite 3 to 10 Tri-sodium phosphate 10 to Sodium molybdate Kerosene Castor oil 3to.6 Otod Water to form an emulsion, and it is then, of.

course, that the chemical reactions. that develop the adhesive qualities of the composi tion, will take place. After these reactions have taken place, the emulsion is adapted to Application filed April 17, 1922. Serial No. 554,204.

be used as a glue or as a coating or to be commingled with. other substances, such as paints or calcimine, which contain certain color pigments. lNhen desired, however, the color-producing pigments may be commingled with the dry composition. "When the composition is to be used simply as a glue,

no additions to the formula given, except water, will be required.

Casein produces the colloidal properties,

imparting to the glue powder adhesive qualities. Calcium chloride, sodium sulphite and tri-sodium phosphate are used as a solvent in an aqueous solution. To this is added calcium hydroxide, having the property of uniting with casein forming calcium caseinate, which are insoluble, and imparting to the glue emulsion waterproof qualities.

Sodium sulphite, in contact with the trisodium phosphate, reduces the alkalinity of the glue mixture and prevents staining and also imparts a penetratingquality to the glue. Sodium molybdate is used for the purpose of resisting and retarding the fon' mation of nitrogen, ammonia being pre cipitated. The kerosene oil is used for thepurpose of preventing calcium hydroxide from decomposing. Castor oil is incorporated to give more body to the glue emulsion. Kerosene and castor oil are preferred but not necessary elements of the composition.

What ll claim is: An adhesive composition made substantially in accordance with the following for- Calcium chloride a- 5 to 1 5 mula:

ram.

Casein 50 to 75 Calcium hydroxide 10 to 30 Sodium sulphite l 3 to it) 'llri-sodium phosphate 10 to 20, Sodium molybdate 'to. 4' 

